Abstract:An HF propagation link via ionospheric reflections has been established for several years between Platteville, Colorado and Urbana, Illinois at a separation distance of 1,401 km. Although the probe is wideband in nature, covering the frequency range from 5 to 15 MHz, the transmitter is capable of transmitting two sets of CW waves at a frequency separation as narrow as 2 Hz. The signals are coherently received. Since the receiver bandwidth is 50 Hz, a beat is observed if the frequency separation is less than 50… Show more
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